--project OctoFX # Space between argument name and value
--project=OctoFX # Equal sign between argument name and value
--project "OctoFX Web Site" # Argument values with spaces need to be quoted
"--project=OctoFX Web Site" # If using equals, quote both the name and value, not just the value

All commands require you to pass the URL of the Octopus Server's API endpoint, and an API key which is used to authenticate you.